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Mermaid Resting on a Coral Ledge

A seated mermaid relaxes on an elevated coral ledge beside a round sea urchin shell and a small ocean chest.

A seated mermaid beside a sea urchin shell and a small underwater chest.
Mermaid Resting on a Coral Ledge
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A4 format (portrait), black outlines on a white background · for home and classroom use

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A Quiet Moment on a Coral Ledge

In this ocean setting, a mermaid sits peacefully atop a natural coral formation. Beside her rests a spherical sea urchin along with a small underwater chest perched securely on the rocky seafloor ledge.

Sea Urchins and Their Hard Spherical Shells

Sea urchins are spiny marine animals related to starfish that protect their soft inner bodies with a hard round shell called a test. When a sea urchin dies, its sharp protective spines fall away, leaving behind a patterned, hollow dome on the seabed.

Natural Colors of Sea Urchins and Coral Formations

  • Sea urchin shell: lavender, dark purple, olive green, or reddish brown
  • Coral ledge: pale pink, golden orange, and grayish beige
  • Underwater wooden chest: rich mahogany, dark brown, with tarnished brass corners
Questions and answers

Questions and Answers About Sea Urchins and Ocean Floor Treasures

What are the sharp spines of a sea urchin used for?
Sea urchins use their movable spines for defense against predators and for moving slowly across rocks and ocean reefs while feeding on algae.
How do sea urchins move without legs?
Along with their spines, sea urchins have hundreds of tiny, suction-tipped tube feet that allow them to attach securely to coral ledges and crawl in any direction.
What is a sea urchin shell made out of?
The hard shell, or test, is made of interlocking calcium carbonate plates secreted by the animal to protect its internal organs from ocean currents and predators.
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